otelgrpc: add WithMeterProvider option

[codeboten]

Adding the ability to set a MeterProvider to otelgrpc instrumentation for future use.

[codecov]

Codecov Report

Merging #1094 (f3ef15c) into main (8cf7954) will decrease coverage by 0.0%.
The diff coverage is 20.0%.

@@           Coverage Diff           @@
##            main   #1094     +/-   ##
=======================================
- Coverage   69.4%   69.3%   -0.1%     
=======================================
  Files        135     135             
  Lines       6113    6118      +5     
=======================================
+ Hits        4243    4244      +1     
- Misses      1742    1746      +4     
  Partials     128     128             

Impacted Files	Coverage Δ
...ation/google.golang.org/grpc/otelgrpc/grpctrace.go	53.8% <20.0%> (-3.7%)	⬇️

[bogdandrutu]

@codeboten please rebase

@Aneurysm9 @MrAlias please help us with this PR.

[bogdandrutu]

@codeboten please rebase

[codeboten]

@bogdandrutu done. @open-telemetry/go-approvers would be great to get some feedback on this PR before I need to rebase again, thanks!

[bogdandrutu]

@codeboten you need another rebase

[codeboten]

@bogdandrutu I'm not seeing anything needing rebase in github 🤔 i did rebase yesterday though.

[MrAlias]

@codeboten do you have a plan or design doc/issue for the future metric instruments planned to be added here? Is this a PR you plan to submit after this?

I want to be sure we don't couple this instrumentation to the unstable metrics signal without a plan forward with how it will be used.

[codeboten]

@codeboten do you have a plan or design doc/issue for the future metric instruments planned to be added here? Is this a PR you plan to submit after this?

I want to be sure we don't couple this instrumentation to the unstable metrics signal without a plan forward with how it will be used.

The metrics I would expect we would want out of this instrumentation would likely be what's defined in the spec here.

This PR is specifically to allow the grpc instrumentation to configure a meter provider in the collector (see open-telemetry/opentelemetry-collector#4030) as we have the ability for today with the tracer provider.

I don't immediately plan on adding metrics to the instrumentation as you mentioned the stability isn't there yet, but i can add an issue and follow up on it at a later time if that works for you.

[codeboten]

@MrAlias is there a way to move this PR forward or would you prefer to close it and reinstate when the metrics api is stable? I'm not sure how to move forward at this point.

[bogdandrutu]

@MrAlias @codeboten the metrics API is stable, let's move forward with this PR :)

[MrAlias]

It looks like #2700 supersedes this, closing. Please reopen if this was in error.